Restructuring and Asset Impairment Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and asset impairment charges	$ 17.6		$ 25.3	$ 18.0	$ 25.3
Restructuring costs	10.0	$ 0.4		10.4	25.3
Restructuring reserve	0.7			0.7		$ 2.3
Non-cash impairment charges	7.6
Cash payments for restructuring				$ 2.2
Impairment of property plant and equipment	6.5
Impairment of intangible assets	1.1
Special Termination Benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs	9.4
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 0.6		10.6		10.6
Restructuring reserve			3.4		3.4
Restructuring reserve related to pension plans			7.6		7.6
Non-cash forfeiture income					0.4
Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring costs			13.4		13.4
Non-cash impairment charges			5.4		5.4
Cash payments for restructuring			8.0		8.0
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring costs			$ 1.3		$ 1.3